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          <h4 id="title">Clustering example</h4>
          <p id="shortdesc">Example of using &lt;code&gt;ol.source.Cluster&lt;/code&gt;.</p>
          <div id="docs"><p>This example shows how to do clustering on point features.</p>
</div>
          <div id="tags">cluster, vector</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.Cluster.html" title="API documentation for ol.source.Cluster">ol.source.Cluster</a></li>,<li><a href="../apidoc/ol.source.MapQuest.html" title="API documentation for ol.source.MapQuest">ol.source.MapQuest</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Circle.html" title="API documentation for ol.style.Circle">ol.style.Circle</a></li>,<li><a href="../apidoc/ol.style.Fill.html" title="API documentation for ol.style.Fill">ol.style.Fill</a></li>,<li><a href="../apidoc/ol.style.Stroke.html" title="API documentation for ol.style.Stroke">ol.style.Stroke</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li>,<li><a href="../apidoc/ol.style.Text.html" title="API documentation for ol.style.Text">ol.style.Text</a></li></ul></div>
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        <form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
          <textarea class="hidden" name="js">var count &#x3D; 20000;
var features &#x3D; new Array(count);
var e &#x3D; 4500000;
for (var i &#x3D; 0; i &lt; count; ++i) {
  var coordinates &#x3D; [2 * e * Math.random() - e, 2 * e * Math.random() - e];
  features[i] &#x3D; new ol.Feature(new ol.geom.Point(coordinates));
}

var source &#x3D; new ol.source.Vector({
  features: features
});

var clusterSource &#x3D; new ol.source.Cluster({
  distance: 40,
  source: source
});

var styleCache &#x3D; {};
var clusters &#x3D; new ol.layer.Vector({
  source: clusterSource,
  style: function(feature, resolution) {
    var size &#x3D; feature.get(&#x27;features&#x27;).length;
    var style &#x3D; styleCache[size];
    if (!style) {
      style &#x3D; [new ol.style.Style({
        image: new ol.style.Circle({
          radius: 10,
          stroke: new ol.style.Stroke({
            color: &#x27;#fff&#x27;
          }),
          fill: new ol.style.Fill({
            color: &#x27;#3399CC&#x27;
          })
        }),
        text: new ol.style.Text({
          text: size.toString(),
          fill: new ol.style.Fill({
            color: &#x27;#fff&#x27;
          })
        })
      })];
      styleCache[size] &#x3D; style;
    }
    return style;
  }
});

var raster &#x3D; new ol.layer.Tile({
  source: new ol.source.MapQuest({layer: &#x27;sat&#x27;})
});

var raw &#x3D; new ol.layer.Vector({
  source: source
});

var map &#x3D; new ol.Map({
  layers: [raster, clusters],
  renderer: &#x27;canvas&#x27;,
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});
</textarea>
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        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Clustering example&lt;/title&gt;
&lt;script src="https://code.jquery.com/jquery-1.11.2.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"&gt;
&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="http://openlayers.org/en/v3.11.1/css/ol.css" type="text/css"&gt;
&lt;script src="http://openlayers.org/en/v3.11.1/build/ol.js"&gt;&lt;/script&gt;

&lt;/head&gt;
&lt;body&gt;
&lt;div class="container-fluid"&gt;

&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;

&lt;/div&gt;
&lt;script&gt;
var count &#x3D; 20000;
var features &#x3D; new Array(count);
var e &#x3D; 4500000;
for (var i &#x3D; 0; i &lt; count; ++i) {
  var coordinates &#x3D; [2 * e * Math.random() - e, 2 * e * Math.random() - e];
  features[i] &#x3D; new ol.Feature(new ol.geom.Point(coordinates));
}

var source &#x3D; new ol.source.Vector({
  features: features
});

var clusterSource &#x3D; new ol.source.Cluster({
  distance: 40,
  source: source
});

var styleCache &#x3D; {};
var clusters &#x3D; new ol.layer.Vector({
  source: clusterSource,
  style: function(feature, resolution) {
    var size &#x3D; feature.get(&#x27;features&#x27;).length;
    var style &#x3D; styleCache[size];
    if (!style) {
      style &#x3D; [new ol.style.Style({
        image: new ol.style.Circle({
          radius: 10,
          stroke: new ol.style.Stroke({
            color: &#x27;#fff&#x27;
          }),
          fill: new ol.style.Fill({
            color: &#x27;#3399CC&#x27;
          })
        }),
        text: new ol.style.Text({
          text: size.toString(),
          fill: new ol.style.Fill({
            color: &#x27;#fff&#x27;
          })
        })
      })];
      styleCache[size] &#x3D; style;
    }
    return style;
  }
});

var raster &#x3D; new ol.layer.Tile({
  source: new ol.source.MapQuest({layer: &#x27;sat&#x27;})
});

var raw &#x3D; new ol.layer.Vector({
  source: source
});

var map &#x3D; new ol.Map({
  layers: [raster, clusters],
  renderer: &#x27;canvas&#x27;,
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
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